Cast-ikon cab-wheel



H. H. SCOVILLE.

I Car Wheel.

I Patented July 13. 1852.

UNITED STATS T HIRAAI H. SGOVILLE, OF CHICAGO, ILLINOIS.

CAST-IRON CAR-WHEEL.

To all whom it may concern:

Be it known that I, HIRAM H. ScovILLn, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Railroad- Car Wheels, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form part of this specification, and in which Figure 1 is an exterior face or side view of the wheel; Fig. 2 a transverse section through the line a: w of Fig. 1.

My invention consists in forming castiron car wheels with interlacing arms, of a bent or S shape, and so arranged that one set of arms unite the outer edge of the hub with the inner edge of the rim, while intermediate arms, alternately, connect the opposite edges of the same parts, the several arms of the wheel, thus arranged, being braced by a ring at their oints of intersection. The rim (A) of this wheel and hub (B) are connected by one set of arms (C) which unite the outer edge or end of the hub with the inner edge of the rim, and are connected by another set of corresponding, intermediate arms (D) which unite the inner end of the hub with the outer edge of the rim. Thus the arms of the one set are alternate with those of the other set, the several arms interlacing as represented, and being braced, where they cross, by a ring (E) each of the said arms being curved as seen in Fig. 2. A few of the peculiarities and advantages of this arrangement and configuration of the arms C and D, are lightness and strength together with simplicity and economy in the construction of such a wheel, and the adaptability of its form to the inequality in shrinking of the several parts while cooling in the process of being cast, also as presenting but little liability of the casting to blow, by furnishing good and sufficient vents for the escape of the confined air and the gas generated in the mold in casting. That great strength is given to a wheel by this specified shape and arrangement of the arms is evident from the fact that the connections uniting the rim and the hub resemble, as it were, a series of reverse or compound pointed arches tied together at their crowns by the ring E, the opposite sides of each arch being formed by adjoining arms. Such a configuration and arrangement not only combines lightness with strength but gives a beauty and symmetry to the wheel. But perhaps the most important advantages obtained fro-m this form of construction are those peculiar to the manufacture of the wheel, for, it will be seen, that but two annular cores and of the same transverse sections as the spaces marked a and b in Fig. 2, will be necessary to form the said spaces which constitute the interiors of the arches above referred to; while the intervening spaces on the one side of the Wheel, that separate each alternate arm, will serve to firmly support the annular cores that form the spaces a 7), and the corresponding intervening spaces on the opposite side of the wheel will furnish the necessary area of escape, by suitable perforations through the mold, for the air and gas to pass off as the metal is poured into the mold. The curved, 8 form of the arms, by bending more or less as the strain comes upon them, compensates for the inequality in the expansion and contraction of the rim as compared with the hub and arms, so that in casting, as the metal shrinks, the straining of the rim will be prevented without any injurious strain pon the arms, and a similar adaptability to unequal expansion will be presented when the wheel is attached to a car and running.

Having thus described my improved car wheel, what I claim as new therein and desire to secure by Letters Patent is The double curved arms interlacing one another and uniting the opposite edges of the rim and hub substantially as specified.

In testimony whereof I have hereunto subscribed my name.

HIRAM H. SCOVILLE.

Witnesses A. Nor, H. L. Rockne 

